Yes, you found yourself an RPM, but not the one in the Red Book. Have a look here - perhaps -013 http://coppercoins.com/diesearch.php?date=1960&thismint=d&thistype=mmom&page=1
You'll find that for that year, there are tons of RPMs to locate. Some are more valuable than others, but in most years where there are a ton, the values are generally lower. That said, finding the DDO with the RPM makes for a fine find. Lot's of hunting to achieve that, but the process is fun and the payoff can be handsome. You just never know...
